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I need a datasheet

  1. 24th November 2004 01:07 AM #1
    riyantoro riyantoro is offline

    I need a datasheet

    Hi all
    I wanna make an amplifier type AB
    Anyone of you can help me please..
    What kind of transistor should I use?
    I have used BC 637 n BC 638 but i failed
    Help me please..

    Thanks
    :lol:
  2. 24th November 2004 01:28 PM #2
    Sebi Sebi is offline
    Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....
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  3. 26th November 2004 04:30 AM Thread Starter #3
    riyantoro riyantoro is offline
    Quote Originally Posted by Sebi
    Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....
    output speaker: 5W
    impedance 8 Ohm
    Vcc 12 Volt
    Imean the power supply voltage is 12 Volt..

    thanks for helping me..
    :P
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  4. 26th November 2004 05:56 AM #4
    Nigel Goodwin Nigel Goodwin is offline
    Super Moderator
    Quote Originally Posted by riyantoro
    Quote Originally Posted by Sebi
    Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....
    output speaker: 5W
    impedance 8 ohm
    Vcc 12 Volt
    Imean the power supply voltage is 12 Volt..

    thanks for helping me..
    :P
    You can't get 5W into 8 ohms from 12V, unless you use a speaker coupling transformer, or a bridged amplifier (two amplifiers). Maximum power into 8 ohms off 12V is only about 2W for a normal single ended amplifier.
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    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
  5. 28th November 2004 12:12 AM #5
    hotwaterwizard hotwaterwizard is offline
    How about this one?


    or this one?

    http://www.redcircuits.com/Page80.htm


    or this one?

    http://sound.westhost.com/jll_hood.htm
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  6. 29th November 2004 02:06 AM Thread Starter #6
    riyantoro riyantoro is offline
    Oh, that's too complex man..
    I'm still a beginner.. :P
    Well, i'm so sorry coz i wanna make an Amplifier type AB not type A like you mean..

    Then, i used a speaker with this specification:
    8 Ohm 1/4 Watt, not 5 Watt
    I still use 12 volt of Vcc
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  7. 29th November 2004 03:18 AM #7
    TheOne TheOne is offline
    Here is a simple design based around a common LF351 opamp that will drive a small loudspeaker. The transistors act as current boosters for the opamp. The transistors you mention would also work as any other small NPN, PNP pair

    The DC gain is 100 with the 3.9nF cap rolling off the gain at higher frequencies. Depending on what your input level will be you may need to have a potentiometer on the input to attenuate high input levels.
    Attached Images
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  8. 29th November 2004 10:19 AM #8
    Sebi Sebi is offline
    Some simple? The LM386 from NSC.
    Attached Images
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  9. 29th November 2004 02:04 PM #9
    hotwaterwizard hotwaterwizard is offline
    Here is one.
    Attached Images
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